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Description
This model is a compound source controlled-rectifier excitation system based on the IEEE type ST3 excitation system model described in the 1981 IEEE committee report [1]. The EXST3 component was developed in line with the references [1] [2].
Mask and Parameters
AVR parameters
Expanding the "EXST3 diagram" displays the block diagram in the parameters window.
Name | Description | Unit | Parameter range |
Tr | Regulator input filter time constant. This input filter is not part of the IEEE committee report and there are no typical values recommended in [1]. It was added for flexibility. N.B. This parameter can be set to “0” if the filter is not used. | s | -- |
VImax | Maximum regulator input voltage | pu | -- |
VImin | Minimum regulator input voltage | pu | -- |
Tb | AVR lead-lag numerator time constant | s | -- |
Tc | AVR lead-lag denominator time constant | s | -- |
Ka | AVR filter gain | -- | -- |
Ta | AVR filter time constant | s | -- |
VRmax | Maximum voltage regulator output | pu | -- |
VRmin | Minimum voltage regulator output | pu | -- |
| Kj | Voltage regulator gain | -- | -- |
Exciter Parameters
Expanding the "Exciter diagram" displays the block diagram in the parameters window.
Name | Description | Unit | Parameter Range |
EFDmax | Maximum exciter output voltage | pu | -- |
Kg | Feedback gain constant of the inner loop field regulator | - | -- |
VGmax | Maximum inner loop voltage feedback | pu | -- |
Kp | Potential circuit real part gain coefficient | - | -- |
Ki | Potential circuit imaginary part gain coefficient | - | -- |
Kc | Rectifier loading factor proportional to commutating reactance | - | -- |
Xl | Reactance associated with potential source | pu | -- |
ThetaP | Potential circuit phase angle | Degrees | -- |
Initial value tab
Name | Description | Unit | Variable = {Possible Values} |
Ifd0 | Synchronous machine field current initial value | pu | -- |
Efd0 | Exciter output voltage initial value | pu | -- |
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\begin{equation}
V_{t}=\sqrt{{V_{d^2}+}{V_{q^2}}} \\
\end{equation} |
References
1. I. C. Report, "Excitation System Models for Power System Stability Studies," in IEEE Transactions on Power Apparatus and Systems, vol. PAS-100, no. 2, pp. 494-509, Feb. 1981.
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